1812417949 has 4 divisors (see below), whose sum is σ = 1819309536. Its totient is φ = 1805526364.

The previous prime is 1812417931. The next prime is 1812417977. The reversal of 1812417949 is 9497142181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1812417949 - 2¹³ = 1812409757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1812417899 and 1812417908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812414949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3445399 + ... + 3445924.

It is an arithmetic number, because the mean of its divisors is an integer number (454827384).

Almost surely, 2^1812417949 is an apocalyptic number.

It is an amenable number.

1812417949 is a deficient number, since it is larger than the sum of its proper divisors (6891587).

1812417949 is an equidigital number, since it uses as much as digits as its factorization.

1812417949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6891586.

The product of its digits is 145152, while the sum is 46.

The square root of 1812417949 is about 42572.5022637852. The cubic root of 1812417949 is about 1219.2313417083.

The spelling of 1812417949 in words is "one billion, eight hundred twelve million, four hundred seventeen thousand, nine hundred forty-nine".